Fodor's Expert Review Brimketill
Grindavík
Free
Five kilometers (3 miles) west of Grindavík, this naturally carved lava tub is constantly filled and drained by ocean surf. Folklore says that the geological pool was the giantess Oddný's favorite spot to bathe. On windy days it's thrilling to watch the incredible force of the sea—just be careful of slippery rocks.